Deadlock latch

Abstract

A deadlock or latch comprising a body and a bolt member pivotally mounted on a first hub, pivotally mounted on the body remote from the pivoting axis of said first hub, said bolt member being resiliently biased so as to maintain its fully open and fully closing positions in abutment with stop means, and a second hub having a cam surface abutting one end of a slide member resiliently biased into abutment with said cam surface and arranged for sliding movement into and out of a locking position engaging a stop member on the first hub when the bolt member is in its fully closing position so as to prevent rotation of the first hub for movement of the bolt member out of its fully closing position.

What is claimed is: 
     
       1. A deadlock or latch comprising a body, a first hub, first hub pivotal mounting means for pivotally mounting said first hub on said body, a bolt member, bolt member pivotal mounting means for pivotally mounting said bolt member on said first hub, said first hub pivotal mounting means being disposed on the body remote from said bolt member pivotal mounting means, said deadlock or latch having stop means and said bolt member being biased by a first resilient means so as to maintain a fully open position and a fully closing position in abutment with said stop means, said first hub having a stop member and said deadlock or latch also having a rotatable second hub spaced from said first hub and having a first cam surface, and a slide member having one end biased by a second resilient means into abutment with said first cam surface and being arranged for sliding movement into and out of a locking position engaging said stop member on said first hub when said bolt member is in its fully closing position whereby rotation of said first hub for movement of said bolt member out of its fully closing position may be prevented, and actuating means on said second hub responsive to deflection of said bolt member from its fully closing position for rotating said second hub and first cam surface causing said slide member to move out of its locking position for releasing said first hub member. 
     
     
       2. The deadlock or latch of claim 1 wherein said bolt member and said first hub are arranged so that when said bolt member is in its fully closing position and is struck, it is deflected into said lock body, without damage to the dead lock or latch. 
     
     
       3. The deadlock or latch of claim 2 wherein said actuating means on said second hub comprises a second cam surface for engagement by said bolt member when it is deflected into the body so that the second hub is rotated to enable movement of the slide member out of its locking position. 
     
     
       4. The deadlock or latch of claim 3 wherein the bolt member is arranged so that when it is deflected into the lock body it initially adopts a partially retracted position from which partially retracted position it is urged into its fully retracted position by said first resilient biasing means. 
     
     
       5. The deadlock or latch of claim 4 wherein said stop means is provided on the body and the bolt member has a pin for abutment with said stop means when the bolt member is in its fully closing position. 
     
     
       6. The deadlock or latch of claim 5 wherein said stop means is positionally adjustable in the direction of projection of the bolt member when in its fully closing position so that the fully closing position of the bolt member may be adjusted. 
     
     
       7. The deadlock or latch of claim 6 wherein is provided a captive screw having a head disposed so as to be accessible from outside the lock body and a nut in screw threaded engagement with said screw, and said stop means comprises a retainer plate having one end pivotally mounted on the lock body and a second end remote from said one end provided with a recess for receiving said nut.